fix vs2017 build break (#2574)

jenkins/windows_c_VsDevCmd.cmd

@@ -25,3 +25,4 @@ IF ERRORLEVEL 1 (
 
 where msbuild
 msbuild -version
+

jenkins/windows_c_build_as_dynamic.cmd

@@ -36,7 +36,7 @@ rem no error checking
 pushd %cmake-root%\cmake\%CMAKE_DIR%
 
 echo ***Running CMAKE for building dynamic***
-cmake %build-root% -Dbuild_as_dynamic:BOOL=ON -Duse_edge_modules=ON
+cmake %build-root% -Dbuild_as_dynamic:BOOL=ON -Duse_edge_modules=ON -G %VSVERSION%
 if not !ERRORLEVEL!==0 exit /b !ERRORLEVEL!
 popd